feat: добавить генерацию image variants

- добавлен shared config presets, custom transforms и allowlist hosts
- реализованы Backend endpoints для assets, presets и variants
- добавлена orchestration через PostgreSQL, RabbitMQ, S3 и worker
- обновлён Gateway read-through flow с L1 cache и корректным Vary: Accept
- добавлена миграция resize_mode для variants lookup
- обновлены dev scripts, env template, lockfile и документация

packages/queue/src/amqp.ts

@@ -0,0 +1,29 @@
+import type { Channel } from "amqplib"
+
+import type { GenerateVariantJob } from "./jobs.js"
+import type { QueueTopology } from "./topology.js"
+
+export async function assertQueueTopology(channel: Channel, topology: QueueTopology) {
+  await channel.assertExchange(topology.jobsExchange, "direct", { durable: true })
+  await channel.assertExchange(topology.jobsDeadLetterExchange, "direct", { durable: true })
+  await channel.assertQueue(topology.generateVariantQueue, {
+    deadLetterExchange: topology.jobsDeadLetterExchange,
+    deadLetterRoutingKey: topology.generateVariantDeadLetterRoutingKey,
+    durable: true,
+  })
+  await channel.assertQueue(topology.generateVariantDeadLetterQueue, { durable: true })
+  await channel.bindQueue(topology.generateVariantQueue, topology.jobsExchange, topology.generateVariantRoutingKey)
+  await channel.bindQueue(
+    topology.generateVariantDeadLetterQueue,
+    topology.jobsDeadLetterExchange,
+    topology.generateVariantDeadLetterRoutingKey,
+  )
+}
+
+export function publishGenerateVariantJob(channel: Channel, topology: QueueTopology, job: GenerateVariantJob) {
+  return channel.publish(topology.jobsExchange, topology.generateVariantRoutingKey, Buffer.from(JSON.stringify(job)), {
+    contentType: "application/json",
+    deliveryMode: 2,
+    persistent: true,
+  })
+}

packages/queue/src/index.ts

@@ -1,2 +1,3 @@
+export * from "./amqp.js"
 export * from "./jobs.js"
 export * from "./topology.js"